西安石油大学学报（自然科学版）2025，Vol.40Issue(5)：74-78,132,6.DOI:10.3969/j.issn.1673-064X.2025.05.009
缝洞型油藏氮气驱启动剩余油力学机制
Study on Mechanical Mechanism of Starting Residual Oil in Nitrogen Flooding of Fractured-Vuggy Reservoirs
摘要
Abstract
The mechanical mechanism of starting residual oil during different stages of nitrogen flooding in fractured-vuggy reservoirs was explored based on mechanical analysis.Nitrogen flooding can be divided into three stages:bottom-up displacement around the injec-tion well,horizontal displacement between injection and production wells,and top-down displacement around the production well.By an-alyzing the combination relationships of displacement force,capillary force and gravity in different fracture-cavity combination models in different displacement stages,the mechanical mechanism of starting residual oil during nitrogen flooding was clarified,and a formula for calculating the fracture opening limit at starting residual oil during nitrogen flooding was established.The theoretical calculation results of the crack opening limit are consistent with the physical simulation results of the typical fractured-vuggy combination models.Clarif-ying the mechanical mechanism of starting residual oil during nitrogen flooding can lay a theoretical foundation for the mechanism re-search of nitrogen flooding to improve crude oil recovery and on-site selection of gas injection wells.关键词
氮气驱/力学机制/剩余油/缝洞型油藏Key words
nitrogen flooding/mechanical mechanism/residual oil/fractured-vuggy reservoir分类
能源科技引用本文复制引用
朱桂良..缝洞型油藏氮气驱启动剩余油力学机制[J].西安石油大学学报（自然科学版）,2025,40(5):74-78,132,6.基金项目
国家自然科学基金项目"碳酸盐岩油藏流动机理与开发方法"(U19B6003-02-06) （U19B6003-02-06）
国家科技重大专项"缝洞型油藏注气提高采收率技术"(2016ZX05014-004) （2016ZX05014-004）
